Filters?

[seiko]

With a Tak TSA 120 and with the following eyepieces is it worth me purchasing a UHC and / or OIII filter noting I'd be viewing from a semi light polluted area?

ES 20mm 100' (2")

ES 14mm 100' (2")

ES 9mm 100' (2")

Nagler zoom 3-6mm (1.25")

If I should I'm guessing the targets I'd be trying to view would be better suited to the 2" low power eyepieces?

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Takahashi TSA120

Celestron Nexstar 5i

[John]

I'd definitely be thinking of a 2" UHC or O-III filter. Most of the time it would be used with the 2" eyepieces (including the 9mm). I have 102mm and 120mm ED refractors and use a 2" Astronomik O-III filter to view planetary nebulae and supernova remnants. Some of the smaller planetaries benefit from quite high magnfications.

The larger objects such as the Veil Nebula will be too large even for your 20mm / 100 degree eyepiece but it's well worth observing them anyway. The Veil is almost invisible without such a filter but one of the finest sights in visual astronomy (in my opinion) with one.

[seiko]

I'd definitely be thinking of a 2" UHC or O-III filter. Most of the time it would be used with the 2" eyepieces (including the 9mm). I have 102mm and 120mm ED refractors and use a 2" Astronomik O-III filter to view planetary nebulae and supernova remnants. Some of the smaller planetaries benefit from quite high magnfications.

The larger objects such as the Veil Nebula will be too large even for your 20mm / 100 degree eyepiece but it's well worth observing them anyway. The Veil is almost invisible without such a filter but one of the finest sights in visual astronomy (in my opinion) with one.

thanks John, do I need both?

[swamp thing]

Opinions are divided on this. I find the O-III more effective from dark sky sites as I find when observing from urban environments, its very tough to get dark adapted enough to get the best results with it. Others differ prefering the more aggressive O-III from urban sites and UHC from dark sites.

Its tough to know what camp you'll be in until you try one or either. Do you have a local society where you can 'suck em and see' ?

[seiko]

Opinions are divided on this. I find the O-III more effective from dark sky sites as I find when observing from urban environments, its very tough to get dark adapted enough to get the best results with it. Others differ prefering the more aggressive O-III from urban sites and UHC from dark sites.

Its tough to know what camp you'll be in until you try one or either. Do you have a local society where you can 'suck em and see' ?

not really, but I couldn't just about afford the skywatcher ones if they aren't too bad?